Relativistic TWT with a rod slow-wave supporting structure and a concept of hybrid antenna-amplifier device

Anatoli S. Shlapakovski

doi:10.1117/12.351203

1 July 1999 Relativistic TWT with a rod slow-wave supporting structure and a concept of hybrid antenna-amplifier device

Anatoli S. Shlapakovski

Proceedings Volume 3702, Intense Microwave Pulses VI; (1999) https://doi.org/10.1117/12.351203
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

Waveguide structure with an inner rod supporting slow-wave propagation allows one to combine a TWT-amplifier and a surface wave radiating antenna in a single hybrid device. Such a device could significantly extend the range of possibilities for microwave beam control at the high level of radiated power. In the work presented, the linear theory is developed for a relativistic Cherenkov amplifier, which configuration is a circular waveguide with an inner dielectric rod and an annular electron beam between the rod and outer wall. Dielectric rod antennas typically operate in the fundamental non-axisymmetric HE₁₁ mode, therefore, the dispersion relation is derived for the general case of non-axisymmetric perturbations. The achievable gain and bandwidth are determined from the numerical solutions of the dispersion relation for various waveguide and beam parameters. Spatial growth rates for the HE₁₁ mode, symmetric TM₀₁ mode (usual TWT operating mode), and other high-order modes are compared. Investigations of the parameter space allow one to find sets of parameters where the HE₁₁ mode dominates. The gain and bandwidth values in this case can be typical for usual relativistic TWTs at accessible beam currents and voltages and reasonable geometries for the X-band frequencies and above. Key characteristics of the proposed concept for a high-power microwave source are formulated, and possible advantages of a hybrid antenna-amplifier are discussed.

Citation Download Citation

Anatoli S. Shlapakovski "Relativistic TWT with a rod slow-wave supporting structure and a concept of hybrid antenna-amplifier device", Proc. SPIE 3702, Intense Microwave Pulses VI, (1 July 1999); https://doi.org/10.1117/12.351203

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